US2016152486A1PendingUtilityA1

Preparation and Use of Zinc Compounds

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Assignee: HAYDALE GRAPHENE IND PLCPriority: Jul 16, 2013Filed: Jul 16, 2014Published: Jun 2, 2016
Est. expiryJul 16, 2033(~7 yrs left)· nominal 20-yr term from priority
Inventors:Afshin Tarat
H10P 14/3426H10P 14/265H10P 14/203H10F 77/251H01L 21/02554H01L 21/02628C01G 9/02C07F 3/06C01P 2004/20C01P 2004/03C01P 2002/22C01G 9/00C07C 51/412
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Claims

Abstract

The present invention relates to methods of producing layered basic zinc acetate (LBZA) crystals from a reaction solution comprising zinc ions, acetate ions, and a basic compound, wherein (i) acetate is the only counter-ion for zinc in the reaction solution; and/or (ii) the basic compound is a hydroxyalkyl amine; and/or (iii) the basic compound is a first basic compound and the reaction solution further comprises a second basic compound having a higher pKa than the first basic compound. The invention also relates to methods of preparing ZnO materials from LBZA crystals, to methods of making electronic or semiconductor-based components from such ZnO materials, and to LBZA crystals and materials themselves.

Claims

exact text as granted — not AI-modified
1 . A method of producing layered basic zinc acetate (LBZA) crystals from a reaction solution comprising zinc ions, acetate ions, and a basic compound, wherein:
 acetate is the only counter-ion for zinc in the reaction solution; and/or   the basic compound is a hydroxyalkyl amine; and/or   the basic compound is a first basic compound, and the reaction solution further comprises a second basic compound having a higher pKa than the first basic compound.   
     
     
         2 . A method according to  claim 1 , wherein zinc acetate is the only zinc compound used to form the reaction solution. 
     
     
         3 . A method according to  claim 1 , wherein acetate is the only counter-ion for zinc in the reaction solution and the basic compound is a hydroxyalkyl amine. 
     
     
         4 . A method according to  claim 1 , wherein the basic compound is tris(hydroxymethyl)methylamine. 
     
     
         5 . A method according to  claim 1 , wherein the reaction solution is formed by dissolving zinc acetate in water. 
     
     
         6 . A method according to  claim 5 , wherein the concentration of zinc acetate is between 0.01 to 0.3 M. 
     
     
         7 . A method according to  claim 1 , wherein the basic compound has a pKa≦9 at 25° C. 
     
     
         8 . A method according to  claim 1 , wherein the basic compound is a first basic compound, and the reaction solution further comprises a second basic compound having a higher pKa than the first basic compound, and wherein the second basic compound is added to the reaction solution after the first basic compound. 
     
     
         9 . A method according to  claim 1 , wherein the basic compound is a first basic compound, and the reaction solution further comprises a second basic compound having a higher pKa than the first basic compound, wherein the second basic compound is a hydroxyalkyl amine. 
     
     
         10 . A method according to  claim 9 , wherein the second basic compound is ethanolamine. 
     
     
         11 . A method according to  claim 1 , wherein the reaction solution has a pH of 5.2 to 7.3. 
     
     
         12 . A method according to  claim 1 , wherein the reaction solution has a pH of between 5.7 to 6.7. 
     
     
         13 . A method according to  claim 1 , wherein the reaction solution has a pH of between 6.1 to 6.3. 
     
     
         14 . A method according to  claim 1 , comprising subjecting the reaction solution to microwave irradiation. 
     
     
         15 . A method according to  claim 14 , wherein the LBZA crystals are nanosheets. 
     
     
         16 . A method according to  claim 1 , comprising allowing the reaction solution to stand. 
     
     
         17 . A method according to  claim 16 , wherein the reaction solution is allowed to stand at ≦75° C. 
     
     
         18 . A method according to  claim 17 , wherein the reaction solution is allowed to stand at ≦40° C. 
     
     
         19 . A method according to  claim 16 , wherein the LBZA crystals are nanobelts. 
     
     
         20 . A method of making a ZnO material, comprising producing LBZA crystals by a method according to  claim 1 , and then pyrolytically decomposing the LBZA crystals. 
     
     
         21 . A method of making an electronic or semiconductor-based component, comprising making a ZnO material by a method according to  claim 20 , and incorporating the material into an electronic or semiconductor-based component. 
     
     
         22 . A LBZA crystal obtainable by a method according to  claim 1 . 
     
     
         23 . A ZnO material obtainable by a method according to  claim 20 .

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